Wave-shaped tunnel
Creates an organic arch instead of a conventional box-like hide.
Website-exclusive pricing · New designs arrive here 7 days before Etsy
Low-profile wave tunnel
Sandflow Under-Gravel Aquarium Cave
A smooth shelter that flows beneath the substrate and leaves a clean, wave-shaped entrance at the surface.
$11.69$12.9910% lower than Etsy
Made to order · Ships in 1–5 business daysU.S. shipping $5.99 for the first item · +$1.99 each additional item · Shipping details
PETG plasticFor freshwater or saltwater aquariums
14 matte colorsChoose the finish that fits your aquascape
Simple careRinse with clean water before tank placement
Let the substrate become the landscape
A quiet tunnel beneath a rolling sandscape.
Sandflow is designed around a low, sweeping tunnel that can be covered with sand or fine gravel. Leave the curved openings exposed and the surrounding substrate becomes part of the finished shape.
The compact profile suits shrimp, bettas, small fish, nano aquariums, minimalist layouts, and planted aquascapes where open water space matters.
Easy to bury
The low body disappears neatly beneath sand or fine gravel.
Compact footprint
Adds a protected route without dominating a smaller display.
Recent Etsy customer reviews
What customers say about Sandflow.
These reviews were originally posted by customers on Etsy. Etsy ratings are shown for transparency but are not included in TankHaven3D’s Google review markup.
5/5
“Fish love it and it’s fun to watch them use it! Adds a whole other dimension to the aquarium.”
Plan the whole setup
Compare the fit before you choose.
Use these focused collections and practical guides to compare dimensions, placement, and the amount of shelter your aquarium needs.
Shop by inhabitantBetta fish cavesCompare products →Shop by inhabitantShrimp hidesCompare products →Shop by installationUnder-gravel aquarium cavesCompare products →Practical guideChoose a cave for a bettaRead the guide →Practical guidePlan hides for a shrimp tankRead the guide →Practical guideChoose the right aquarium cave sizeRead the guide →